Leather skiving device



March 9, 1948. sERGlO 2,437,565

LEATHER SKIVING- DEVICE Filed April 8, 1946 3 Sheets-Sheet l ATTORNEKS.

March 9,1948. P, A SERGIO 2,437,565

LEATHER SKIVING DEVICE Filed April 8, 1946 3 Sheets-Sheet 2 INVENTOR 5yWWW March 9, 1948. r P. A. SERGIO 2,437,565

I LEATHER SKIVING DEVICE Filed April 8, 1946 3 Sheets-Sheet 3 IN VENTOI?Arron/wins Patented Mar. 9, 1948 UNI ED STATES PATENT OFFICE LEATHERSKIVING DEVICE Paul A. Sergio, South Bend, Ind.

Application April '8, 1946, Serial No. 660,390

16 Claims.

This invention relates to leather skiving devices, and more particularlyto a device by means of which an edge or marginal portion of a piece ofleather may be cut to tapered form.

Various constructions of devices for skiving and cutting leather havebeen developed heretofore. However, such prior devices have all hadlimitations with respect to their method of use and general utility.Among such limitations have been inability to work upon the leathersoles of shoes and a requirement that the work piece be of small sizeand substantially flat contour. Furthermore, prior devices have not beencapable of cutting contours other than plain tapers.

In the operation of half so'ling a shoe, the worn outer sole of theshoe, which usually constitutes a piece of leather extending the fulllength of the shoe, must be cut back of the worn portion, as at theforward part of the shank. The half sole which is to replace the wornsole portion thus removed is skived at the inner face of the rearportion thereof, and the front portion of the remainder of the outersole is skived correspondingly at its outer face. The skived portionsover- .lap in face engagement and are secured together when the halfsole is applied to provide a lapped joint. It is .a simple matter toskive the half sole, either by hand or by skiving devices now availableon the market, because of the favorable and workable properties andcondition of the leather of a new half sole and because a half sole canbe handled and manipulated easily. Skiving of the remnant of the outersole of the shoe presents entirely different conditions and problems.Present machines are not capable of doing such work upon the leatherconstituting a part of a shoe. Hand skiving of such shoe sole portionsis therefore necessary, and must be done under adverse conditions. Thehardened and toughened condition of a well worn and weathered soleleather is one adverse factor and a curved contour of the sole crosswiseof the shoe is .another adverse factor, the latter because it makesaccurate and uniform cutting by hand very difficult. Also, trial anderror methods of shaping the cut complementary to the skived portion ofthe half sole to be applied thereover are necessary because there is nocutting guide and a hand operation is inherently irregular andinaccurate. As a result of these conditions the lapped joints at therear portions of the half soles applied to a pair of shoes are neveruniform and the rear edge of the half sole is likely to be wavy orbulgy, so that gaps are left at the lapped joint.

The primary object of this invention is to provide a device which iscapable of skiving, a tough, hard, weathered sole -portion accuratelyand uniformly whil it is attached to and forms a part of a shoe, wherebythe above mentioned difficulties, limitations and defects of presentpractices are overcome.

A further object is to provide a device of this character which iscapable of forming a stepped out of any selected depth and of forming ataper extending from the bottom of that stepped out.

A further object is to provide a device of this character which issimple in construction, inexpensive, easy to operate and to adjust,whose use does not require special skill, and which facilitates rapidskiving, accurately and uniformly, without regard to the hardness ortoughness of the leather.

Other objects will be apparent from the description and appended claims.

In the drawings:

Fig. 1 is a view of the device in elevation illustrating its use toskive the outer sole attached to a shoe. 7

Fig. 2 is an elevational view of the device as seen from the left inFig. 1.

Fig. 3.is atop plan view of :the device.

Fig. 4 is a fragmentary view of a shoe, illustrating its sole portion incross-section, and skived to receive a half sole as seen in dottedlines.

Referring to the drawings, which illustrate the preferred embodiment .ofthe invention, the numeral I0 designates the base of a frame whichmounts a standard illustrated as consisting of a plurality of verticalribs I2. An integral journal block 14 is supported upon the standard. Anupright portion l6 projects vertically above the block Id and mounts aforwardly projecting neck portion l8 which terminates .in a head 20..

A horizontal shaft is .journaled in the upper portion of the journalblock 'I 4 andproj ects therefrom to mount a pinion or gear v212 and acrank 24. A horizontal stud is journaled intermediate the height of theblock l4 and mounts a gear or pinion '26 which meshes with gear 22. .Athird horizontal .shaft .28 is journaled in the lower portion of .block14 with its opposite ends projecting from the block. One projecting endportion of shaft .28 mounts a gear or pinion 3B which meshes with thegear '28. The opposite end of said shaft mounts a cylindrical work feedmember .32 having a circumferential groove .34,

adjacent its outer .e d and a longitudinally ribbed or serratedperiphery as illustrated at 36.

A horizontal member 38 projects from the block l4 at approximatelymid-height thereof. The member 38 has a bore extending transverselytherethrough to receive a stud 48 which is fixedly clamped therein, asby a set screw or other clamping member 42. The stud 48 mounts ahorizontal work table 44 which is positioned above and at one side ofthe cylindrical member 32 with its upper surface in a horizontal planesubstantially tangent to the uppermost peripheral portion of themember32. The work table 44 has a groove 46 at its inner portion invertical register with the groove 34 of member 32.

The head 28 of the frame has a vertical bore therein whose axis, ifprojected, would intersect the axis of the work feed member 32, and ashaft 48 is mounted in said bore forfree sliding guided movement. Theshaft may have an elongated longitudinal passage 41 therethroughadjacent its upper end at the portion received in the head 28, and across pin 49 carried by the head 28 extends freely through said passageand prevents rotation of said shaft 48. A transverse plate 58 is fixedon the upper end of shaft 48 and has a bearing portion projectingtherefrom against which bears a set screw 52 which is threaded in an ear54 projecting from the head 28. A rigid member of inverted L-shape has ahorizontal portion 56 fixedly secured to the lower end of shaft 48 and avertical plate portion 58 extending adjacent one face of the journalblock I4. A coil spring 68 encircles the shaft 48 with its opposite endsbearing against the bottom face of head 28 and against the top face ofmember 56, respectively, to normally urge the latter part downwardly tothe limit permitted by the adiustment of the set screw 52. A stud shaft62 is secured to the plate 58 and projects therefrom to detachablyjournal a cylindrical idler member 64 having an enlarged circumferentialcutting edge portion 66 at its outer end. The shaft 62 is substantiallyparallel to shaft 28 and its axis intersects a projection of the axis ofshaft 48. The cutting edge 66 registers with the groove 34 of the workfeed member 32. i

A skiving blade 68 ismountedupon a blade carrier 18 having a rearwardlyprojecting arm 12 which is journaled on a stud 14 projectinghorizontally from the block I4 at the side thereof opposite to themember 38. The blade carrier 18 has an upwardly projecting ear 16 at itsouter or forward portion to which an upwardly projecting rigid link 18is pivoted at 88. A horizontal stud 82 projects laterally from themember 56 and the upper end of the link 18 is pivotally connectedthereto by means of a cambushing 84. The blade carrier 18 slidably anddetachably mounts the skiving blade 68 and carries an ear 86 at itsouter end in which is threaded a. set screw 88 bearing against the bladeand serving to adjust its longitudinal position in the carrier.

The device is used to skive the front portion of the shank of the outersole 98 of a shoe 92, which outer sole has been cut at the front portionof the instep or arch portion of the shoe rearwardly of the worn portionthereof. The shoe will have the usual inner sole 94 and a heel 96. Theshoe is prepared for the skiving opera tion by loosening the outer sole98 from the inner sole back substantially to the heel 96. This permitsthe loosened shank portion of the outer sole remaining after the wornsole portion has been cut away to be flexed as seen in Fig. 1, whereby,when the shoe is positioned with the heel portion uppermost and the soleportion facing the machine, the free end portion of the outer sole whichis to be skived bears upon the work table 44 with one edge portionthereof bearing against the work feed member 32 and the cutting edge 66of the member 64.

When the parts are so positioned, the device is operated by rotating thecrank 24 to drive the shaft 28 and the work feed member 32 through thegear train 22, 26, 38. As the work feed member 32 rotates, the lowerface of the flexed outer sole is engaged by the serrations 36 of saidmember 32 to advance the sole laterally and between the members 32 and64. The member 64 is an idler, and the movement of the sole relativethereto and in engagement therewith causes rotation thereof and of thecircumferential cutting portion 66. The member66 cuts a groove in theouter face of the shank portion of sole 68 whose bottom is parallel toand spaced from the outer or front transverse edge thereof. The blade 68is so positioned that it cuts the sole diagonally in a plane extendingfrom the bottom of the groove formed by cutter 66 to the inner face ofthe forward edge of the sole. The skived cut so formed is bestillustrated in Fig. 4, and forms the shoulder or step 98 at the outerface portion of the sole and the tapered sole portion I88. This skivedout forms a seat for a half sole as shown in dotted lines in Fig. 4, andpermits a partial skiving only of the half sole so that an exposedfeather edge on the half sole is not necessary and an edge abutmentbetween the reduced thickness edge of the half sole and the shoulder 98is provided. Consequently, weakening of the rear edge of the half soleis avoided. The uniformity of the skived cut of sole 88 assures a solidsnu fit of the sole parts and an attractive, smooth joint between thehalf sole and the sole 98.

It will be observed that the blade 68 is automatically positioned inproper relation to the onter 66 by virtue of the link 18 connecting theblade carrier with the cutter carrier. Consequently, if the sole leatheris tough so that cutter 66 cannot penetrate it to the full depthpermitted by the setting of screw 52, i. e., if the spring 68 iscompressed, the cutter blade 68 will be adjusted automatically tocompensate for the condition encountered. For the purpose of adjustingthe blade 68 accurately to form a out beginning at the bottom of the outor groove formed by cutter 86, the cam 84 may be rotated to raise orlower the front part of the blade carrier 78 and the blade 68 carriedthereby.

Th device provides for regulation of the depth of the shoulder 98 cut inthe sole, to accommodate for differences in the thickness of differentshoe soles, for example, as between the soles of mens shoes and womensshoes or between the soles of dress shoes and heavy work shoes. The setscrew 52 constitutes this adjusting means. Adjustment of this screwregulates the spacing of the cutter idler 64 and its cutter 66 from theWork feed member 32, Note that danger of blunting the edge of cutter 66is avoided by the provision of the grooves 34 and 46 which are of a sizeand depth to receive the cutter 66 with clearance in the event the idler64 is lowered into engagement with the work table 44 and the work feedmember 32.

The device has other advantageous features. All operating parts areaccessible for adjustment. The cutter idler 66 and the cutter blade 68are mounted for rapid and convenient removal, as for grinding andsharpening. The device is rugged and will perform satisfactorily underthe most exacting conditions of use.

duced inother forms utilizing the same combina tion and arrangement ofparts and falling within the spirit of the invention and the scope ofthe appended claims.

I claim:

1. A leather skiving device comprising a frame mounting a work support,a work feed roll rotatable on said frame and located below and at oneside of said support, a rotatable cutter spaced above said feed roll,means for supporting said cutter, a skiving blade located opposite tosaid support for engagement by leather fed by said roll, a blademounting carried by said frame, means for rotating said feed roll toadvance leather from said support to and past said cutter and blade,means for adjusting said cutter supporting means to groove leather tothe desired depth and means for adjusting said blade mounting to skiveleather at a depth corresponding to the depth of said groove.

2. A leather skiving device comp-rising a frame mounting a work support,a work feed roll rotatable on said frame and located below and at oneside of said support, a rotatable cutter spaced above said feed roll forcutting a groove in leather, means for supporting said cutter, a skivingblade located opposite to said support for engagement by the groovedleather fed by said roll, a blade mounting carried by said frame forpositioning said blade to cut away a part of said leather at a depthdetermined by the depth of the groove therein, and means for rotatingsaid feed roll, said cutter supporting means and blade carrier beingresiliently supported,

3. A leather skiving device comprising a frame mounting a work support,a work feed roll rotatable on said frame and located below and at oneside of said support, a rotatable grooving cutter spaced above said feedroll, means for supporting said cutter, a skiving blade located oppositeto said support for engagement by leather fed by said roll, a blademounting carried by said frame, and means for rotating said feed roll,and means for vertically adjusting said cutter supporting means and saidblade carrier whereby one edge of said blade engages the workpiece atthe bottom of the groove formed therein by said grooving cutter.

4. A leather skiving device comprising a frame mounting a work support,a work feed roll rotatable on said frame and located below and at oneside of said support, a rotatable cutter spaced above said feed roll,means for supporting said cutter, a skiving blade located opposite tosaid support for engagement by leather fed by said roll, a blademounting carried by said frame, and means for rotating said feed roll,said cutter supporting means and blade carrier being interconnected andadjustable means for positioning the same simultaneously.

5. A leather skiving device comprising a frame, a roll journaled on saidframe, means for rotating said roll, a mounting adjustably carried bysaid frame, a circular grooving cutter journaled on said mountingadjacent to said roll, and a skivin blade carried by said mounting withits cutting edge adjacent and between said cutter and said roll and withone end of said cutting edge positioned to register with the tangent ofthe edge of said groove cutter in the plane of said Work.

6. A leather skivingdevice comprising a frame, a roll journaled on saidframe, means for rotating said roll, a mounting adjustably carried bysaid frame, a circular groove cutter journaled on said mounting adjacentto said roll, and a skiving blade carried by said mounting with itscutting edge adjacent and between said cutter and said roll, and meansfor adjusting said blade on said mounting.

7. A leather skiving device comprising a frame, a roll journaled on saidframe, means for rotating said roll, a mounting adjustably carried bysaid frame, a circular groove cutter journaled on said mounting adjacentto said roll, and a skiving blade carried by said mounting with itscutting edge adjacent and between said .cutter and said roll, and cammeans for adjusting the vertical postion of said blade on said mountingrelative to said cutter,

8. A leather skiving device comprising a frame, a roll journaled on saidframe, means for rotating said roll, a mounting adjustably carried bysaid frame, a circular groove cutter journaled on said mounting adjacentto said roll, and a skiving blade carried by said mounting with itscutting edge adjacent and between said cutter and said roll, and springpressed means supporting said mounting for vertical movement relative tosaid frame and said roll.

9. A leather skiving device comprising a frame, a roll journaled on saidframe, means for rotating said roll, a mounting adjustably carried bysaid frame, a circular cutter journaled on said mounting adjacent tosaid roll, and a skiving blade carried by said mounting with its cuttingedge adjacent and between said cutter and said roll, and meanssupporting said mounting for Vertical movement relative to said frameand said roll, means limiting downward movement of said mounting, and aspring urging said mounting downwardly.

10. A leather skiving device comprising a frame, a support dependingfrom the upper end of said frame and shiftable vertically, a rotarygroove cutter journaled at the lower end of said support with its axishorizontal, a feed roll journaled on said frame adjacent and below saidcutter, a skiving blade, a blade carrier pivoted to said frame, and alink pivoted to the free end of said carrier and to said shiftablesupport at its opposite ends, said carrier positioning said bladealongside and between said roll and cutter.

11. A leather skiving device comprising a frame, a support dependingfrom the upper end of said frame and shiftable vertically, a rotarycutter journaled at the lower end of said support with' its axishorizontal, a feed roll journaled on said frame adjacent to and belowsaid cutter, a skiving blade, a blade carrier pivoted to said frame, anda link pivoted to the free end of said carrier and to said support atits opposite ends, said carrier positioning said blade alongside andbetween said roll and cutter, and means normally urging said supportdownwardly.

12. A leather skiving device comprising a frame, a support dependingfrom the upper end of said frame and shiftable vertically, a rotarycutter journaled at the lower end of said support with its axishorizontal, a feed roll journaled on said frame adjacent to and belowsaid cutter, a skiving blade, a blade carrier pivoted to said frame, anda link pivoted to the free end of said carrier and to said support atits opposite ends, said carrier positioning said blade alongside andbetween said roll and cutter, and cam means 00-- operating with saidsupport and link to adjust the pivot axis of said link relative to saidsupport.

13. A leather skiving device comprising a frame, a support dependingfrom the upper end of said frame and shiftable vertically, a rotarycutter journaled at the lower end of said support with its axishorizontal, a feed roll journaled on said frame adjacent to and belowsaid cutter, a skiving blade, a blade carrier pivoted to said frame, anda link pivoted to the free end of said carrier and to said support atits opposite ends, said carrier positioning said blade alongside andbetween said roll and cutter, and means for adjusting said blade endwisetoward and from said cutter.

14. A leather skiving device comprising a frame, a support reciprocablymounted on said frame, a rotary groove cutter journaled on said support,work feed means including a roller journaled on said frame adjacent andparallel to said cutter, resilient means urging said support toward saidroller, a blade carrier pivoted to said frame and connected to saidsupport, and a blade mounted on said carrier and positioned to cutleather at an angle to and at the depth of the bottom of a groovetherein formed by said cutter as it emerges from between said cutter androller,

15. A leather skiving device comprising a frame, work supporting meanscarried by said frame and including a feed roller, a bodily shiftablesupport carried by said frame and spring pressed toward said roller, arotary cutter journaled on said support and adapted to cut a groove inone face of a work piece on said supporting means, and a blade carriedby said frame and by said shiftable support for slicing said work pieceat an angle to and commencing at the bottom of said groove.

16. A leather skiving device comprising a. frame, work supporting meancarried by said frame and including a feed roller, a bodily shiftablesupport carried by said frame and spring pressed toward said roller, arotary cutter journaled on said support and adapted to out a groove inone face of a work piece on said supporting means, and a blade unitshiftably connected to said frame and support for slicing said workpiece from the bottom of said groove to provide the work piece with atapered portion terminating at an abrupt shoulder.

PAUL A. SERGIO.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,238,088 Baxter Aug. 28, 19171,488,470 Brogan Apr. 1, 1924 1,511,228 Lund 'Oct. 14, 1924 1,638,915Bunker et al. Aug. 16, 1927

